Apparatus for casting vent pipe flashings



Sept. 9, 1958 M. F. SMITH APPARATUS FOR CASTING VENT PIPE FLASHINGS 2 Sheets-Sheet 1 Filed June 18, 1956 Sept. 9, 1958 M. F. SMITH APPARATUS FOR CASTING VENT PIPE FLASHINGS Filed June 18, 1956 2 Sheets-Sheet 2 I INVENTOR. MacK F. Sniff/v.

United States Patent APPARATUS FQR CASTING VENT PIPE FLASHINGS Mack F. Smith, Montgomery, Ala.

Application June 18, 1956, Serial No. 591,957

2 Claims. (Cl. 22-152) This invention relates to apparatus for casting lead vent pipe fiashings and has for an object the provision of a method of the character designated by means of which such castings may be produced in quantity with a minimum expenditure of time and labor.

7 A more particular object of my invention is to provide apparatus including a plurality of matrix members and a core member together with means to bring the core member successively into cooperative relationship with the matrix members.

A still further object of my invention is to provide apparatus for casting vent pipe flashings including a plurality of matrix members and a core member together with improved heating means for maintaining the said members at the required temperature to prevent premature chilling of the metal during the casting operation.

Another object of my invention is to provide apparatus for casting vent pipe flashings which shall include a plurality of'matrix members and a core member together with means to bring the core member into cooperative relationship, successively, with the matrix members by a movement in a rectilinear path.

Briefly my invention comprises a horizontally disposed support or table mounted on a suitable stand for rotation. Mounted on the table, at regular intervals are a plurality of matrix members (preferably 4 or more) each comprising a vertically disposed plate portion and a downwardly inclined sleeve portion, the inner ends of the sleeve portions .being'provided withadditional support from ;the table. Mounted alongside the tableis a core member, also comprising a'plate portion and aplug portion complementary to the plate and sleeve portionsof the matrix members. Supporting and actuating means are provided for'the core member which are adapted to move the core member in a rectilinear path into and out of cooperative relationship with a facing matrix member. Index means are provided for the table whereby to bring the matrix members successively into position facing the core member.

These and other features of my invention are illustrated in the accompanying drawings forming a part of this application, in which:

Fig. l is a side elevation;

Fig. 2 is a plan view;

Fig. 3 is a section taken along the line IIIIII of Fig. 1, drawn to a larger scale;

Fig. 4 is a section drawn to a larger scale than Fig. 1, through a matrix member and the core member while in cooperative relationship, and with a flashing poured;

Fig. 5 is a section taken along the line V-V of Fig. 4 and drawn to a smaller scale;

Fig. 6 is a side elevation of a flashing; and,

Fig. 7 is a plan view of a flashing;

Referring now to the drawings for a better understanding of my invention, the flashing which my improved apparatus is adapted to cast is illustrated generally in Figs. 6 and 7 of the annexed drawings and comprises a plate portion 10 and a centrally located sleeve portion 11, the

sleeve portion being at an angle, usually other than a right angle, to the plate portion.

My improved apparatus comprises a vertical stand l2, on the upper end of which is rotatably mounted a support or table 13. The table is provided with a bearing sleeve 14 on its under side which fits over the stand 12 and forms a bearing for the table. The stand 12 may be provided near its upper end with regularly spaced indentations 16 in which a spring pressed ball latch 17, carried by the bearing 14, is adapted to engage. As shown, the indentation 16 are at intervals of to each other so that the support 13 may be positioned successively at regular intervals of 90. 7

Mounted on the table 13, at regularly spaced intervals of 90 to each other, are four mold halves 18, each comprising a plate portion 19 and a sleeve portion 21, the latter being downwardly inclined with respect to the plate portion and extending inwardly of the table 13. The inner ends of the sleeve portions 21 may be supported by means of vertical plates 22 into which the inner ends of the sleeve portions are adapted to fit.

Mounted adjacent the table 13 is the other half 20 of the mold, or core member, which comprises a plate portion 23 and a plug portion 24 adapted to enter successively into the sleeve portions 21 of the matrix members 18 with the plate portion 23 engaging the plate portion 19 together to form a molding cavity as shown in detail in Fig. 4 of the drawings.

Rigidly secured to the outer face ofthe plateportion 23 is a bar 26, the outer end of which is provided with rack teeth 27 and is mounted in a guide member 28. The

guide member 28 is mounted on a stand 29 and carries a pinion 31 which meshes with the rack teeth 27 and which may be operated by crank arms 32 tojmove the core member into engagement with the matrix member.

Referring to Fig. 4 it will be seen that each of the plate members 19 is supported along its lower edge in a-fchannel 33 which is welded to the table 13'and thatsuitable heatinsulating or-packing means'34 is disposed in the channel between the plate member and the channel.

The casting space between the core member and the matrix member is provided by means of grooves 36 formed in. the plate members 19 and which extend down the sides 'and'across the bottom of each plate portion 19. The grooves 36 cooperate with complementary ribs 37 on the plate portion 23 of they core member 20 which enter .the grooves36 and are of such height as to hold the plate portions of the matrix member and the core member in spaced relation, and also serve to seal the sides and bottom of the space between the core and matrix members. As will be seen from Fig. 4 the plug portion 24 of the core member 20 and the sleeve portion 21 of the matrix member 18 are of difierent diameters to provide a casting space. The outer end of the sleeve portion 21 is closed by means of a plate 38 which is provided with a groove 39 into which the end 41 of the plug portion 24 engages to seal the space between the plug and sleeve portion when the core and matrix members are in cooperative relationship as shown in Fig. 4 of the drawing. The upper edges 42 and 43 of the plate portions 19 and 23, respectively are turned outwardly as shown in Fig. 4 to provide for the entrance of the molten metal when the casting is being poured. In order to maintain the matrix member and the core member at the proper temperatures during the casting of the flashing, I provide electrical heating elements in the form of a coil 46 for the matrix member, which coil may be embedded in a suitable binding material 47. The binding material 47 with its coil is applied fiat against the side of the plate portion 19 and around the sleeve portion 21. The coil 46 is supplied with electric current from a suitable source of energy 48 through wires 43a and 48b and the heat supply may be varied by a rheostat, or resistance element 519.

Similarly, the plate portion 23 of the core member and the plug portion 24 thereof may be heated by means of a heating element 51 which may be embedded in a suitable binding material 52. i The coil 51', as shown in Fig. 4, is applied across the outer face of the plate member 23 and inside the plug portion 24 of the matrix member. The coil 51 is also supplied with electric current from the source of energy 48 through a wire 53 connected to the wire 48a and may be controlled by a rheostat By this means the temperature 'of the matrix and the core members may be regulated to provide that required to maintain the lead in a fluid condition during casting and yet permit it to harden promptly when the pouring is'completed.

From the foregoing description the operation of my improved apparatus will be readily understood. With one of the matrix members 18 positioned in front of the core member, as shown in Fig. 1 of the drawing, the core member is advanced into cooperative relationship with the matrix member by means of the rack and pinion 27 and 31 moving the rigid supporting bar 26 downwardly in a rectilinear path as indicated until the members assume the position shown in Fig. 4 of the drawing. With the matrix and core members heated in the manner described, lead is poured into the space between the core and matrix members and is allowed to harden sufficiently for the core member to be withdrawn. The table 13 is then turned 90 and positioned by means of the indexing latch 17 engaging on e of the depressions 16 in the stand 12. The core member is then advanced into the cooperating relationship with the next matrix member 18 and a second flashing poured. As soon as the first described flashing has cooled sutficiently it is stripped from the matrix member and that matrix member is then ready to cooperate again with the core member to form a flashing. The matrix members are brought into cooperative relationship with the core member successively in the manner described. The flashings are poured, cooled and stripped from the mold in the manner described thus providing a continuous process.

It will thus be apparent that I have provided an improved apparatus for casting lead pipe flashings which is simple of design and operation and by means of which such flashings may be cast in a minimum of time with a minimum of labor and expense.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that'it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appended claims.

What I claim is:

1. In apparatus for casting vent pipe fiashings, a vertically extending stand, a rotary support rotatably mounted on said stand and having a plurality of matrix members disposed at regular intervals thereon, each of said matrix members comprising an upwardly extending sleeve portion and a vertically disposed plate portion at the outer end of said sleeve portion, each of said vertical plate portions having a groove fromed in the outer surface thereof inwardly of the edges defining the vertical plate portion and extending vertically along each side and across the bottom of said outer surface, a core member comprising a plug portion and a plate portion cooperating with said matrix members and adapted for moving into and out of cooperative relationship therewith, indexing means cooperating with said rotary support and said stand to position the matrix members successively opposite the core member and in facing relationship therewith so that the core member can be moved into and out of cooperative relationship with successive matrix members, means to advance and withdraw the core member in a rectilinear path in line with the matrix member, a rib on the inner surface of said core plate portion arranged in complementary relation to and adapted to enter the groove in the cooperating plate portion of the matrix member and form a seal therewith, a plate closing the end of the sleeve portion of the matrix member and having a circular groove therein to receive the inner end of the plug portion of the core member in sealing relation and controlled heating means to maintain the desired temperature of the core and matrix members.

2. Apparatus as defined in claim 1 in which the means to move the core member comprises a rigid supporting bar secured to the rear of the plate portion of the core member and inclined downwardly at the same angle as 'the sleeve portions of the matrix members with the plug portion of the core member in line with the sleeve portion of a facing matrix member, and means to actuate the bar in a rectilinear path of movement to move the core member into and out of cooperative relationship with the matrix member.

References Cited in the tile of this patent UNITED STATES PATENTS 1,296,321 Ross Mar. 4, 1919 1,378,984 Soss May 24, 1921 1,546,824 Buckles July 21, 1925 1,721,115 Harrington July 16, 1929 2,140,607 Thompson Dec. 20, 1938 

